Running Django tests in parallel on MariaDB, get "No such file or directory: 'mysqldump'"

I have a Django project running locally, with its database as MariaDB 10.6 running in a Docker container. The Django tests work fine, but when I try to run them with a --parallel flag I get an error "FileNotFoundError: [Errno 2] No such file or directory: 'mysqldump'".

The docker-compose.yml is:

services:
  db:
    container_name: my_db
    env_file: .env
    image: mariadb:10.6.17
    ports:
      - 5556:3306
    restart: unless-stopped
    volumes:
      - ./docker/db/init:/docker-entrypoint-initdb.d
      - mysql_data:/var/lib/mysql

volumes:
  mysql_data:

And here's the traceback after running manage.py test --parallel:

Using shuffle seed: 2678352772 (generated)
Found 965 test(s).
Creating test database for alias 'default'...
Cloning test database for alias 'default'...
Traceback (most recent call last):
  File "manage.py", line 26, in <module>
    main()
  File "manage.py", line 22, in main
    execute_from_command_line(sys.argv)
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
    utility.execute()
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/core/management/__init__.py", line 436, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/core/management/commands/test.py", line 24, in run_from_argv
    super().run_from_argv(argv)
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/core/management/base.py", line 412, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/core/management/base.py", line 458, in execute
    output = self.handle(*args, **options)
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/core/management/commands/test.py", line 68, in handle
    failures = test_runner.run_tests(test_labels)
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/test/runner.py", line 1054, in run_tests
    old_config = self.setup_databases(
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/test/runner.py", line 950, in setup_databases
    return _setup_databases(
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/test/utils.py", line 230, in setup_databases
    connection.creation.clone_test_db(
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/db/backends/base/creation.py", line 256, in clone_test_db
    self._clone_test_db(suffix, verbosity, keepdb)
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/db/backends/mysql/creation.py", line 60, in _clone_test_db
    self._clone_db(source_database_name, target_database_name)
  File "/Users/phil/Projects/MyProject/Django/my-project/.venv/lib/python3.8/site-packages/django/db/backends/mysql/creation.py", line 77, in _clone_db
    with subprocess.Popen(
  File "/Users/phil/.local/share/uv/python/cpython-3.8.19-macos-aarch64-none/lib/python3.8/subprocess.py", line 858, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/Users/phil/.local/share/uv/python/cpython-3.8.19-macos-aarch64-none/lib/python3.8/subprocess.py", line 1720, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'mysqldump'

with subprocess.Popen(

No such file or directory: 'mysqldump'